Sandpapering-machine.



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APPLIOATIDN FILED JAR. 13,1903.

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No. 740,319. PATENTED SEPT. 29, 190s.v c. H. SCHMIDT.

SANDPAPERING MACHINE. APPLICATION FILED JAN. 13, 1903. no MODEL. 2 SHEETS-SHEET z.

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UNITED STATES Patented September 29, 1903.

PATENT OFFICE.

SANDPAPERING-MACHINE- $PEGIFICATION forming part of Letters Patent No. 740,319, dated September 29, 1903. Application filed January 13,1903. Serial No. 188,920. (No model.) r

To all whom it may concern:

Be it known that I, CARL H. SCHMIDT, a citizen of the United States, residing at North St. Paul, in the county of Ramsey and State of Minnesota, have invented a new and useful Sandpapering-Machine, of which the following is a specification.

My invention relates to sandpapering-machines, and more particularly to machines for sandpapering moldings, and in its preferred form consists in the construction hereinafter fully described and claimed, and shown in theaccompanying drawings, in which- Figure 1 is a side elevation of my machine, taken from the side on which the operator stands, parts being broken away to show the feed-chain. Fig. 2 is a plan view. Fig. 3 is a.

vertical transverse section, on an enlarged scale, on the line 3 3 of Fig. 1. Fig. lis a detail View showing the mode of securing the springs which support the sandpaper-carrying blocks to the reciprocating carrier. Fig. 5 is a detail View showing a sandpaper-carrying block, the spring supporting it, and the means for fastening the sandpaper to the block.

' base of the machine, which is supported upon suitable legs (not provided with reference characters) and upon which are mounted two standards 2 and 3, each being provided with ways 4 for a reciprocating carrier 5, to which are secured the sandpaper-carrying blocks and other mechanisms, which will be herein: after mentioned. 7

Atone end ofv thebase l is mounted the main shaft 6, at one end of which is mounted a crank 7, which may be used to drive the machine when manually operated, and at the other end is a belt-pulley 10, to which power may be supplied from any suitable source.

Also mounted upon the shaft '6 are two sprocket-wheels 11- and 12. Over the sprocketwheel 11 runs a driving-chain 13, which also passes over a sprocket-wheel 14, mounted on a shaft 15 in one of the standards. At the end of the shaft 15 is a crank 16, which is rigidly secured thereto and has at its opposite end a pin 17 passing through a pitman-rod 18, which is connected at its opposite end by means of a pin 19 with a block 20 upon the reciprocating slide 5, to which it impartsmotion.

Projecting forward from the slide 5 is a screw-threaded rod 21, upon which the blocks .22, to which are secured the springs 23, are

clamped into position by means of a clamping-nut 24. The sandpaper-carrying blocks 25are secured in any desired manner to the ends of the springs 23, by which they are held in yielding contact with the molding, which is fed forward under them in a man ner hereinafter described. It will be ob served that the number of blocks employed corresponds in general to the number of grooves in'the molding and that the springs supporting any two blocks'which areintended to operate upon adjacent surfaces of the molding are not parallel, but project in approximately opposite directions from the supporting-rod. The reason for this arrangement of the sandpaper-carrying blocks is sharp edges or ridges between the curved surfaces of the molding is reduced to a mini-. mum and the original configuration of the molding preserved, while at the same time the surface is smoothed by the action of the sandpaper. Each block must of course have its operating-face of approximately the configuration corresponding to the surface upon. which it is to operate, and the operating-face of each block is preferably provided with a covering 260i some soft material to bring the sandpaper which is passed over that face of the block into more uniform contact with the surface of the molding upon which itis to act. The springs employed to support the sandpaper-carrying blocks and hold them in yielding contact with the molding are preferably divided, as shown, by narrow slots extending from the supporting-block to which the springs are fastened to the other end,

where the springs are secured to the sandpaper-carrying blocks. This feature of construction is provided because it has been found in practice that the separate action of the several tongues of the spring upon the block is such that the block adapts itself more readily to slight irregularities in the pattern of the molding,to allow for-which alateral yieldingof the spring is necessary. Each sandpaper-carrying block is provided on its front surfacethat is, on the side toward the operator-With a clip 27, of spring metal, to hold the end of the sandpaper. The supply of sandpaperis obtained from reels 28, mounted in lugs 29, projecting rearward from the reciprocating slide 5. The number of reels shown in the drawings is two; but it should be understood that a reel is to-be provided for each sandpaper-carrying block, if desired, or that the same reel may be used as a source of supply for a plurality of blocks supported by parallel springs. No operating means is necessary to unwind the sandpaper from the reels, as a simple pull is sufficient for the purpose; but for convenience in winding the sandpaper on the reel a small crank may, if desired,

be attached to the end of each reel.

At the end of the base opposite the main guiding-shaft is mounted an idler-shaft 30, which carries a sprocket-wheel 31, rigidly secured thereto and alined with the sprocketwheel12 on the main driving-shaft. The upper surface of the base is channeled at 32 to permit the passage of an endless feed-chain 33, which travels over the sprockets 12 and 31 and which has projecting from its outer surface a number of spurs 34, designed to engage with the under surface of the molding and to feed it forward under the reciprocatingsandpaper-carryingblocks. Thechannel 32 is throughout the greater portion of its length of such depth that the sprocket-chain lies therein with its upper surface not quite flush with the top of the base of the machine, but having its spurs projecting above that surface. Secured to the standard 2 and just above the channel 32 is a curved spring-arm 35, which bears at either end a presser-roller 36, adapted to force the strip of molding 37 into engagement with the spurs or projections 34 upon the feed-chain 33. A similar pair of spring-pressed rollers may be mounted upon the standard 3, if desired; but ordinarily there is no need of more than one pair of presser-rollers, as after the teeth on the sprocket-chain have once been brought into engagement with the molding there is but little tendency for them to becomedisengaged.

The operation of my improved sandpapering-machine is as follows: The requisite number of sandpaper-carrying blocks of desired configuration having been secured in position by means of the clamping-nut 24 and sandpaper having been adjusted upon the operating-faces of said blocks and clamped in position by means of the spring-clips provided therefor, a strip of molding to be smoothed is introduced under the forward one of the spring-pressed rollers 36 and the machine'set in motion by turning the crank 7 or by starting the belt over the belt-pulley 10. When this is done, motion is imparted from the driving-shaft 6 through the chain 13-to the counter-shaft 15 and thence by means of the crank-and-pitman mechanism to'the recipro c ating slide 5, which carries the spring-pressed sandpapering-blocks. Motion is imparted directly from the main driving-shaft 6 through the sprocket 12 to the feed-chain 33, which by means of the spurs 34 carries the strip of molding forward under the rapidly-reciprocating sandpapering-blocks. The relative sizes of the various driving-sprockets must be such that the feed of the molding is not too fast to prevent the successful action of' wound with sandpaper of the difierent grades desired, so that but little loss of time will be entailed in exchanging the supply of coarser sandpaper for finer. 1

Having now fully described the construction and operation of my improved sandpapering-machine, what I regard as my invention, and desire to secure by Letters Patent,

1.- In a'sandpapering-machine, the combination of a reciprocatory carrier, at leaf-sprin g secured to said carrier, at sandpaper-carrying block attached to said leaf-spring, and operating means for said reciprocatory carrier, substantially as described.

2. Ina sandpapering-machine, the combination of a reciprocatory carrier, a plurality of leaf-springs secured to said carrier, a sandpaper-carrying block secured to each of said springs, and operating means for said mechanisms, substantially as described.

3. In a sandpapering-machine, the combination of a traveling carrier, aleaf-spring secured to said carrier, said leaf-spring being divided by longitudinal slots into a plurality of spring-fingers,a sandpaper-carrying block attached to said leaf-spring, and operating means for said mechanisms, substantially as described. v

4. In a sandpapering-machine, a reciprocating carrier, sandpaper-carrying blocks secured to said carrier, operating means for said carrier, a bed over which molding is adapted to travel and a feed mechanism for said molding comprising a chain provided with spurs to engage the molding, a presserroller to force the molding into operative on- I gagement with said spurs, and driving means for said chain, substantially as described.

5. In a sandpapering-machine, a reciprothereby, operating means for said carrier, and a molding feed mechanism comprising an cating carrier, sandpapering devices carried endless chain provided with spurs adapted to engage the molding, a driving-sprocket and idler-sprockets adapted to carry said chain, and spring-pressed rolls adapted to force the molding into operative engagement with the spurs on the feed-chain, substantially as described.

6. In a saudpapering-maehine, the combination of a base, a channel therein, a feedehain adapted to travel in said channel, driving means for said feed-chain, standards mounted on said base, guideways in said I standards, a reciprocating carrier moving in said guides, spring-supported sandpaper-carrying blocks secured to said carrier, and operating means for said carrier, substantially as described.

In testimony that I claim the foregoing as 1 my own'I have hereto affixed my signature in the presence of two Witnesses.

- CARL H. SCHMIDT.

Witnesses:

JOHN W. HERRICK, EMIL KABNUTH. 

